南京大胜关长江大桥钢梁焊接工艺研究

Welding procedure qualification of grider for Nanjing Dashengguan Yangtze River Bridge

南京大胜关长江大桥是京沪高速铁路的重点工程,是世界上行车时速300公里级别中跨度最大、荷载最重的桥梁。钢梁使用钢种有Q420qE、Q370qE和Q345qD,其中Q420qE为首次大规模使用的新一代桥梁用结构钢,为超低碳贝氏体钢,其供货状态为TMCP+回火,主要用于受力最大的拱肋结构。施工前根据不同的因素进行了选材试验,在选材试验基础上进行多种焊接接头的焊接工艺评定试验,并列出了典型接头的试验结果,为焊接工艺的制定提供了依据。

Nanjing Dashengguan Yangtze River Bridge is the key projects of the Beijing-Shanghai high speed railway.Also it is the largest and heaviest load in the world＇s travel speed of 300 km level.The steel material of this bridge is made of Q420qE, Q370qE and Q345qD.Q420qE is a new generation of bridge structural steel for large-scale use firstly.It is ultra-low carbon bainitic steel,the supply status is TMCP＋tempering,which mainly used by the greatest force in rib structure.Pre-construction we conducted that selection tests according to different factors,then a variety of welded joints of welding procedure qualification tests.We aiso listed the typical test results of joints for welding process,which provided the basis for the development.